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erastovalidia [21]
3 years ago
9

The energy level diagram shown below represents a fictional gas. What is the energy of a photon that would move an electron from

level 2 to level 5?
A. 5.8 eV
B. 4.8 eV
C. 4.2 eV
D. 2.65 eV

Chemistry
1 answer:
Yuri [45]3 years ago
6 0

The energy of a photon that would move an electron from level 2 to level 5 : B. 4.8 eV

<h3>Further explanation</h3>

The electron energy at the nth shell can be formulated:

<h3>En = -Rh / n² </h3>

Rh = constant 2.179.10⁻¹⁸ J

So the electron transfer energy (ΔE)

ΔE = E final- E initial

energy at n=2(level 2) = -5.3 eV

energy at n=5(level 5) = -0.5 eV

So the energy absorbed :

\tt \Delta E=-0.5-(-5.3)=-0.5+5.3=4.8`eV

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Acetic acid has a Kb of 2.93 °C/m and a normal boiling point of 118.1 °C. What would be the boiling point of a solution made by
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Boiling point elevation is given as:

ΔTb=iKbm

Where,

ΔTb=elevation in the boiling point

that is given by expression:

ΔTb=Tb (solution) - Tb (pure solvent)

Here Tb (pure solvent)=118.1 °C

i for CaCO3= 2

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ΔTb=iKbm

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=14.65 °C

boiling point of a solution can be calculated:

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Answer:

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3 years ago
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